random number

Harry1

how do i generate a random number from 0 to 22
thanks!

CJ

random := myvar? // 23

myvar is your variable that holds the random number
random is the resulting random number from 0 to 22

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Parallax Forums - If you're ready to learn, we're ready to help.

T Chap

If it is called at the same point after boot everytime, it may not be so random. It should be triggered by some event, or use the Random Number Generator Object that Chip recently posted, which likely needs modifying with limits in your case.

Post Edited (TChapman) : 3/27/2007 8:10:07 PM GMT

Mike Green

If you have any loops in your program where you wait for an external event whether it's a keypress or button press or a serial input character, put "myvar?" in the loop. This will "stir" the random sequence in a way that's dependent on the "hard to predict" external event.

cgracey

Here's a link to·a real random number generator I made last week:

http://forums.parallax.com/showthread.php?p=639978

It takes 32 longs of code space and 2 longs for variables. It takes one cog, but you only need to run it when you need a new random number:

OBJ

· rr : "RealRandom"

PRI random_0_to_22 : value

· rr.start
· value := ||rr.random // 23
· rr.stop

This will never yield a repeating pattern.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔


Chip Gracey
Parallax, Inc.

Post Edited (Chip Gracey (Parallax)) : 3/27/2007 9:05:57 PM GMT

Harry1

Thank you guys for your help!! XD